Device for the driving of a tool by means of the spindle of a machine-tool

ABSTRACT

Device for the driving of a tool by means of the spindle of a machine-tool in which one of the two elements - spindle-tip of the machine and tool - is provided with at least one axial lug engaging in a matched groove of the other element so as to ensure the driving of the tool by means of the spindle independently of the friction drive which exists between the taper of the tool and the tapered bore of the spindle, characterized by the fact that one of the elements - spindle-nose and tool - carries a part set up onto it so as to be angularly adjustable, this part being provided with said lug or groove, the whole being so arranged that the angular position of the spindle relative to the tool is adjustable when the latter is set up into the spindle and when said lug fits into said groove.

United States Patent [191 'Mottu et a1.

[ DEVICE FOR THE DRIVING OF A TOOL BY MEANS OF THE SPINDLE OF AMACHINE-TOOL [75] Inventors: Andre Mottu; Arnold Heimann,

both of Geneva, Switzerland [73] Assignee: Societe GenevoiseDInstruments De Physique, Geneva, Switzerland [22] Filed: Oct. 12, 1971[21] Appl. No.: 188,214

[56] References Cited UNITED STATES PATENTS 9/1971 Rhodes 90/11 A 6/1971Reed 9/1972 Ingram 279/83 [451 Feb. 5, 1974 Primary ExaminerGilWeidenfeld rn 3.48 1 r li rmrko sinl i s mfla in ABSIRACT Device for thedriving of a toolby means of the spindle of a machine-tool in which oneof the two elements spindle-tip of the machine and tool is provided withat least one axial lug engaging in a matched groove of the other elementso as to ensure the driving of the tool by means of the spindleindependently of the friction drive which exists between the taper ofthe tool and the tapered bore of the spindle, characterized by the factthat one of the elements spindle-nose and tool carries a part set uponto it so as to be angularly adjustable, this part being provided withsaid lug or groove, the whole being so arranged that the angularposition of the spindle relative to the tool is adjustable when thelatter is set up into the spindle and when said lug fits into saidgroove.

1 Claim, 14 Drawing Figures PATENTED 51974 3.780.295

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m [mum ATTORNEYS DEVICE FOR THE DRIVING OF A TOOL BY MEANS OF THESPINDLE OF A MACHINE-TOOL The present invention concerns a device forthe driving of a tool by means of the spindle of a machine-tool in whichone of the two elements spindletip of the machine and tool is providedwith at least one axial lug engaging in a matched groove of the otherelement so as to ensure the driving of the tool by means of the spindleindependently of the friction drive which exists between the taper ofthe tool and the tapered bore of the spindle.

When making borings by machining, the removal of the tool, at the end ofthe machining, requires the tool to be first laterally displaced, in thedirection of the center of the boring, so that the wall of the lattershould not be damaged by its point. Some machine-tools which areprovided with means permitting such lateral displacements of the tool atthe end of the machining operation also comprise a device for stoppingthe spindle in a determined angular position, so that the lateraldisplacement of the tool has the effect of bringing its point closer tothe center of the boring, that is to say, further apart from the freshlymachined boring walls.

Such machines can only be used when they are also provided with adriving device, such as the one mentioned above, which prevents anyangular sliding of the tool into the spindle. Further, they can only beused with monolithic tools and not with compound-tools such as thosecomprising, for instance, an adaptor fitting the tapered bore of thespindle, an extension or a reduction screwed onto this adaptor and atoolcarrying head screwed onto the extension or the reduction. In suchcompound-tools, the angular position of the tool point with regard tothe adaptor is undetermined and varies from one compound-tool to theother.

The object of the present invention is to permit using compound-tools onmachine-tools which are provided with means for the side displacement ofthe tool when at the end of the machining operations.

The driving device according to the invention is characterized by thefact that one of the elements spindle-nose and tool carries a part setup onto it so as to be angularly adjustable, this part being providedwith said lug or groove, the whole being so that the angular position ofthe spindle relative to the tool be adjustable when the latter is set upinto the spindle and when said lug fits into said groove.

The drawing represents, as an example, one preferred embodiment of theinvention and some modifications.

FIG. 1 is an axial section of the spindle end of a machine-tool providedwith a cutting tool.

FIG. 2 is a transverse section thereof along line lI-II of FIG. 1.

FIG. 3 is a sectional view of a part of a modification.

FIG. 4 is a sectional view along line lV-IV of FIG. 3.

FIG. 5 is an elevation view of a part of this modification.

FIG. 6 is a sectional view of a part of another modification.

FIG. 7 is a sectional view along line VII-VII of FIG. 6.

.FIG. 8 is an elevation view and a partial sectional view, along lineVIlI-Vlll of FIG. 10, of another modification.

FIG. 9 is a sectional view of a detail of this modification in anotherposition.

FIG. 10 is a plan view of a detail of this modification.

FIG. 11 is a plan view of a part of another modification.

FIG. 12 is a sectional view of a detail of this modification, along lineXII-Xll of FIG. 11, on a magnified scale.

FIG. 13 is a plan view of a part of another modification, and

FIG. 14 is a sectional view of a detail of this modification, along lineXIV-XIV of FIG. 13, on a magnified scale.

In the embodiment of FIG. 1 and 2, the spindle-nose of a machine-tool,provided with a tapered boring l, is indicated by 2. This spindle-noseis provided, on its front axial side, with two radial grooves 3, alongthe same diameter, for accommodating the driving lugs 4 belonging to thetool. The latter is a compound-tool and comprises an adaptor 5, thetaper 5a of which fits into the spindle boring 1, an extension 6 and atoolcarrying head 7; the tool blade is indicated by 8.

Adaptor 5 is provided, on its external side, with a star-toothing 9which meshes with the corresponding internal toothing of a ring 10having lugs 4. This ring is provided with a radial screw 11 for drivinginto the toothing 9 a key 12 which slides radially in the ring andprevents the latter from moving axially on the adaptor 5. Thisarrangement allows, by untightening screw 11, to release ring 10 formoving it axially downward, hence disengaging its internal toothing 9,for modifiying its angular position with respect to the adaptor.

An elastic ring 13, carried by the adaptor 5, prevents the ring beingremoved from the latter.

Owing to the present arrangement, the angular position of lugs 4 withrespect to the adaptor can be modifled in reason of the angular positionof the tool blade 8, this position being only determined after themounting together of the various tool parts. It results from this thatthe ring 10 can be mounted on the adaptor 5 in the proper angularposition for having the tool blade correctly oriented when the spindlestops in a position controlled by the machine.

In the modification of FIG. 3 to 5, the adaptor indicated by 14, isprovided with an external annular shoulder 14a the upper axial side ofwhich has two segments 15 with a contrate toothing. This shoulder 14a isprovided with two semi-circular grooves 16 (FIG. 4) through which aredriven two screws 17 in a direction parallel to the tool axis andfitting into a ring 18 having, on its axial side facing shoulder 14a, acontrate toothing 19.

When the screws 17 are tightened, the ring 18, carrying the lugs 34which cooperate with the spindle-nose, is angularly locked to theshoulder 14a of the adaptor 14.

The modification of FIG. 6 and 7 differs from that of FIG. 3 to 5 by thefact that the ring, indicated by 20, which carries the lugs 4, is lockedto a shoulder 21a of the adaptor, indicated by 21, by means of anantifriction lining, e.g., made of FERODO (registered Trademark), placedbetween it and the shoulder 21a, which replaces the toothing 15 and 19of the above mentioned modification.

It should be noticed that, in the modification of FIG. 6 and 7, the ring20 is provided with a skirt having a ring-shaped groove 23 for drivingan attachment of the machine-tool for changing the tools automatically.

In the modification of FIG. 8 to 10, the ring, indicated by 24, isprovided, as in the first embodiment, with an internal toothing 24ameshing with a toothing 25 of the adaptor, indicated by 26. The latterhas a V- shaped groove 27 into which fit the tips of two lockingscrews28, diametrically opposed to one another, for locking in place ring 24in the position represented on FIG. 8, wherein two studs 29 of thespindle-nose 30 fit into a diametrical groove 31 contrived into the ring24. When the two screws 28 are untightened, the ring 24 can be loweredbeyond the position represented on FIG. 9 until its toothing 24a leavesthe toothing 25 of the adaptor 26, which permits modifying the angularposition of the ring relative to the adaptor.

In this'modification as in the one of FIG. 6 and 7, the ring is providedwith an external groove for driving an automatic tool changer, whichgroove could be omitted in case the device should be adapted to amachine having no automatic tool changer.

In the modification of FIG. 11 and 12, the adaptor, indicated by 33, isprovided with a trapeze-shaped groove 34 into which partially fits aring made of two crown-shaped segments 35 and 36. These segments extendover slightly less than 180 and rest against each other by one of theirends the latter being locked together by means of a screw 37. A screw 38working on their other ends allows them to be locked into the groove 34or, conversely, to be set free, breaking thus the bond between them andthe adaptor 33. Each segment 35 and 36 is provided with a driving lugindicated by 35a and 36a respectively.

Finally, in the modification of FIG. 13 and 14, the ring, indicated by39, comprises two locking screws 40 having a dented tip which fits intoa toothing 41 of the adaptor 42. It should be noted that this toothing41 can be very thin and that it can be machined with a knurling wheel,for instance, which machining reduces the manufacturing cost. It isenough, for angularly adjusting the position of the ring 39 relative tothe adaptor 42, to untighten the two screws 40 which move permitsturning the ring a desired angle, then to retighten the two screws 40.The ring has two lugs 390 which are being driven by the spindle of themachine-tool.

It should be noticed that all the embodiments described here and themodifications shown herein not only permit using compound-tools withmachine-tools carrying means for laterally displacing the tool at theend of the machining operation, but also, owing to the easy replacementof the orientable ring on the adaptor, achieving, by the use ofmachine-tools having or not having a tool-changer, substantial costsavings, the operator having the opportunity, depending on the type ofmachine-tool used, to only replace the ring whenever the driving meansof the spindle of the machinetool used require it.

We claim:

1. In a machine tool having a drive spindle with a socket for receivinga tool holder assembly, said tool holder assembly comprising a toolholder and a drive ring releasably secured thereto, an axial lug on oneof said spindle and drive ring, a complementary axial groove on theother of said spindle and drive ring to receive said lug for drivingengagement, said tool holder including external teeth around theperiphery thereof, said drive ring having complementary internal teethto drivingly mesh with the teeth of said tool holder in any of aplurality of relative angular positions, means for releasably securingsaid drive ring to said tool holder and to prevent axial displacementtherebetween in any of said plurality of relative angular positions,whereby said tool holder can be released and angularly relocatedrelative to said drive spindle without relative angular movement betweenthe drive spindle and the drive ring.

"UNITED STATES PATENT OFFICE a CERTIFICATE OF CORRECTION Patent No.3,790,296 Dated February 5, 1974 Inventor(s) Andre Mottu and ArnoldHeimann It is certified that.error appears in the above-identifiedpatent and that said Letters Patent are hereby corrected as shown below:

In the heading, insert below line 11',

identified as ['21] Appl.No. 188,214

-'- [30 7 Foreign Application Priority Data 0a., 14, 1970Switzerland.....l5.2l7/7O Signed and sealed this 16th day of July 1974.

(SEAL) Attest:

McCOY M. GIBSON, JR. C. vMARSHALL DANN Attesting Officer Commissioner ofPatents FORM PO-1050 (10-69) I uscoMM-Dc 60376-P69 US. GOVERNMENTPRINTING OFFICE I969 0-366-334,

1. In a machine tool having a drive spindle with a socket for receivinga tool holder assembly, said tool holder assembly comprising a toolholder and a drive ring releasably secured thereto, an axial lug on oneof said spindle and drive ring, a complementary axial groove on theother of said spindle and drive ring to receive said lug for drivingengagement, said tool holder including external teeth around theperiphery thereof, said drive ring having complementary internal teethto drivingly mesh with the teeth of said tool holder in any of aplurality of relative angular positions, means for releasably securingsaid drive ring to said tool holder and to prevent axial displacementtherebetween in any of said plurality of relative angular positions,whereby said tool holder can be released and angularly relocatedrelative to said drive spindle without relative angular movement betweenthe drive spindle and the drive ring.